CVE-2006-1555: VSNS Lemon 3.2.0 allows remote attackers to bypass authentication and access password-protected articles by se

This month

HIGH 7.5DOWNGRADE

CVE-2006-1555 is a high-severity flaw (CVSS 7.5) affecting vsns lemon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

VSNS Lemon 3.2.0 allows remote attackers to bypass authentication and access password-protected articles by setting the vsns[topic_id] cookie to the targeted topic.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.9% (top 20%)
CISA exploited list	No
Published	2006-03-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: tachyon

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-03-31 11:06 UTCPublished CVE record published
2026-06-16 22:23 UTCUpdated Record last modified

tachyon vsns lemon DOWNGRADE

Affected: 3.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2.0

1. Check installed version

apt-cache policy vsns-lemon || rpm -q vsns-lemon || vsns-lemon --version

2. No fixed release: DOWNGRADE to a release before 3.2.0 (Debian / Ubuntu)

apt-cache madison vsns-lemon sudo apt install vsns-lemon=<VERSION_BEFORE_3.2.0> sudo apt-mark hold vsns-lemon

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list vsns-lemon sudo dnf downgrade vsns-lemon-<VERSION_BEFORE_3.2.0> sudo dnf versionlock add vsns-lemon

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2006-1555?

vsns lemon: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-1555 being exploited?

CVE-2006-1555 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2006-1555 affect?

CVE-2006-1555 affects vsns lemon. Severity is high (CVSS 7.5). VSNS Lemon 3.2.0 allows remote attackers to bypass authentication and access password-protected articles by setting the vsns[topic_id] cookie to the targeted topic.

How urgent is CVE-2006-1555?

Priority 46/100. High severity

Related CVEs

CVE-2006-1554 LOW 2.6 DOWNGRADE Cross-site scripting (XSS) vulnerability in VSNS Lemon 3.2.0 allows remote attackers to inject arbitrary web s
CVE-2006-1553 MEDIUM 5.1 DOWNGRADE SQL injection vulnerability in functions/final_functions.php in VSNS Lemon 3.2.0, with magic_quotes_gpc disabl

References

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